Processes for preparing of 3,4-alkylenedioxythiophenes and...

Details Processes for preparing of 3,4-alkylenedioxythiophenes and... Processes for preparing of 3,4-alkylenedioxythiophenes and...

2007-04-10

2007-04-10

Shameem, Golam M. M. (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S029000, C549S049000

Reexamination Certificate

active

10715845

ABSTRACT:
The present invention relates to a process for preparing 3,4-dialkoxythiophenes or 3,4-alkylenedioxythiophenes in high yield via the rapid decarboxylation of 3,4-dialkoxythiophenedicarboxylic acid or 3,4-aklylenedioxythiophenedicarboxylic acid in a water-miscible polar solvent in the presence of copper catalyst under an oxygen atmosphere.

REFERENCES:
patent: 2453103 (1948-11-01), Turnbull, Jr.
patent: 6369239 (2002-04-01), Rauchschwalbe et al.
patent: 6528662 (2003-03-01), Jonas
patent: 6750354 (2004-06-01), Rauchschwalbe et al.

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